function iIntegerCode = ConvertClassStringIntoIntegerCode( strClass )
	%
	switch strClass
		%
		case '+1'
			iIntegerCode = 1;
		%
		case '+2'
			iIntegerCode = 2;
		%
		case '+3'
			iIntegerCode = 3;
		%
		case '+4'
			iIntegerCode = 4;
		%
		case '+5'
			iIntegerCode = 5;
		%
		case '+6'
			iIntegerCode = 6;
		%
		case '0'
			iIntegerCode = 7;
		%
		case '-1'
			iIntegerCode = 8;
		%
		case '-2'
			iIntegerCode = 9;
		%
		case '-3'
			iIntegerCode = 10;
		%
		case '-4'
			iIntegerCode = 11;
		%
		case '-5'
			iIntegerCode = 12;
		%
		case '-6'
			iIntegerCode = 13;
		%
		case '+1-1'
			iIntegerCode = 14;
		%
		case '+2-1'
			iIntegerCode = 15;
		%
		case '+3-1'
			iIntegerCode = 16;
		%
		case '-1+1'
			iIntegerCode = 17;
		%
		case '-2+1'
			iIntegerCode = 18;
		%
		case '-3+1'
			iIntegerCode = 19;
		%
		otherwise
			disp(strClass)
			error('not supported class');
		%
	end;% switch
	%
end % function

